C#中DataGridView导出Excel的两种方法

第一种是用数据流导出:

#region
      savefiledialog savefiledialog = new savefiledialog();
      savefiledialog.filter = "execl files (*.xls)|*.xls";
      savefiledialog.filterindex = 0;
      savefiledialog.restoredirectory = true;
      savefiledialog.createprompt = true;
      savefiledialog.title = "export excel file";
      savefiledialog.showdialog();
      if (savefiledialog.filename == "")
        return;
      stream mystream;
      mystream = savefiledialog.openfile();
      streamwriter sw = new streamwriter(mystream, system.text.encoding.getencoding(-0));
 
      string str = "";
      try
      {
        for (int i = 0; i < datagridview1.columncount; i++)
        {
          if (i > 0)
          {
            str += "\t";
          }
          str += datagridview1.columns[i].headertext;
        }
        sw.writeline(str);
        for (int j = 0; j < datagridview1.rows.count; j++)
        {
          string tempstr = "";
          for (int k = 0; k < datagridview1.columns.count; k++)
          {
            if (k > 0)
            {
              tempstr += "\t";
            }
            tempstr += datagridview1.rows[j].cells[k].value.tostring();
          }
          sw.writeline(tempstr);
        }
        sw.close();
        mystream.close();
      }
 
      catch (exception ex)
      {
        //messagebox.show(ex.tostring());
      }
      finally
      {
        sw.close();
        mystream.close();
      }
#endregion

这种方法的优点就是导出比较快，但是excel的表格里面设置标题，字体样式等都不能弄，因为你是用数据流直接导出为excel的，除非你能在数据流中设置这些样式，这个我还没这本事，哪位大哥会的教一下...嘿嘿

第二种方法是直接写一个类，这个类直接操作excel的：

using system;
using system.collections.generic;
using system.windows.forms;
using system.text;
using system.diagnostics;
using system.io;
using microsoft.office.interop.excel;
 
namespace excel
{
  public class export
  {
    /// <summary>
    /// datagridview导出excel
    /// </summary>
    /// <param name="strcaption">excel文件中的标题</param>
    /// <param name="mydgv">datagridview 控件</param>
    /// <returns>0:成功;1:datagridview中无记录;2:excel无法启动;9999:异常错误</returns>
    public int exportexcel(string strcaption, datagridview mydgv, savefiledialog savefiledialog)
    {
      int result = 9999;
      
      //保存
      
      savefiledialog.filter = "execl files (*.xls)|*.xls";
      savefiledialog.filterindex = 0;
      savefiledialog.restoredirectory = true;
      //savefiledialog.createprompt = true;
      savefiledialog.title = "export excel file";
      if ( savefiledialog.showdialog()== dialogresult.ok)
      {
        if (savefiledialog.filename == "")
        {
          messagebox.show("请输入保存文件名！");
          savefiledialog.showdialog();
        }
          // 列索引，行索引，总列数，总行数
        int colindex = 0;
        int rowindex = 0;
        int colcount = mydgv.columncount;
        int rowcount = mydgv.rowcount;
 
        if (mydgv.rowcount == 0)
        {
          result = 1;
        }
 
        // 创建excel对象
        microsoft.office.interop.excel.application xlapp = new microsoft.office.interop.excel.applicationclass();
        if (xlapp == null)
        {
          result = 2;
        }
        try
        {
          // 创建excel工作薄
          microsoft.office.interop.excel.workbook xlbook = xlapp.workbooks.add(true);
          microsoft.office.interop.excel.worksheet xlsheet = (microsoft.office.interop.excel.worksheet)xlbook.worksheets[1];
          // 设置标题
          microsoft.office.interop.excel.range range = xlsheet.get_range(xlapp.cells[1, 1], xlapp.cells[1, colcount]); //标题所占的单元格数与datagridview中的列数相同
          range.mergecells = true;
          xlapp.activecell.formular1c1 = strcaption;
          xlapp.activecell.font.size = 20;
          xlapp.activecell.font.bold = true;
          xlapp.activecell.horizontalalignment = microsoft.office.interop.excel.constants.xlcenter;
          // 创建缓存数据
          object[,] objdata = new object[rowcount + 1, colcount];
          //获取列标题
          foreach (datagridviewcolumn col in mydgv.columns)
          {
            objdata[rowindex, colindex++] = col.headertext;
          }
          // 获取数据
          for (rowindex = 1; rowindex < rowcount; rowindex++)
          {
            for (colindex = 0; colindex < colcount; colindex++)
            {
              if (mydgv[colindex, rowindex - 1].valuetype == typeof(string)
                || mydgv[colindex, rowindex - 1].valuetype == typeof(datetime))//这里就是验证datagridview单元格中的类型,如果是string或是datatime类型,则在放入缓存时在该内容前加入" ";
              {
                objdata[rowindex, colindex] = "" + mydgv[colindex, rowindex - 1].value;
              }
              else
              {
                objdata[rowindex, colindex] = mydgv[colindex, rowindex - 1].value;
              }
            }
            system.windows.forms.application.doevents();
          }
          // 写入excel
          range = xlsheet.get_range(xlapp.cells[2, 1], xlapp.cells[rowcount, colcount]);
          range.value2 = objdata;
 
          xlbook.saved = true;
          xlbook.savecopyas(savefiledialog.filename);
        }
        catch (exception err)
        {
          result = 9999;
        }
        finally
        {
          xlapp.quit();
          gc.collect(); //强制回收
        }
        //返回值
        result = 0;
      }
      
      return result;
    }
 
 
  }
}

这个优点是能设置样式什么的。缺点就是导出速度慢...

以上两种方法都是参考了很多料的..写在这里以便于相互学习..

补充一下：用第二种方法导出excel会有格式方面的变化，比如身份证号码按科学计算法导出了，不是按原先的模型

改进方法是在写入excel时添加一个格式声明：range.numberformatlocal = "@";

如：// 写入excel

range = xlsheet.get_range(xlapp.cells[2, 1], xlapp.cells[rowcount + 2, colcount]);
range.numberformatlocal = "@";
range.value2 = objdata;

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